Commands using sort (800)

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Url Encode
Returns URL Encoded string from input ($1).

View the current number of free/used inodes in a file system
tune2fs also provides the same information . But the information does not give the current usage , it gives the information when the file system was last mounted. http://www.zaman4linux.in/2010/10/using-up-all-the-free-inodes.html

Find broken symlinks
This is much safer than using -L, because it will not follow links that point to places outside the target directory subtree (CWD, in this case). See here for explanation: http://unix.stackexchange.com/a/38691/9382

Erase a word
hit BACKSPACE more than once to delete more words

Transfers clipboard content from one OS X machine to another
This uses ssh to transfer the contents of one Mac's clipboard to another's. This only works with plain text, sadly. Trying to transfer images will just clear out the remote machine's clipboard, and rich text will be converted to plain text. Using the "Remote Login" must be enabled on the remote machine (via System Preferences' Sharing panel) for this to work.

return external ip
Get your ip address, hostname, ASN and geolocation information. If you want just one field as a text response you can also get that,eg curl ipinfo.io/ip

Suspend to ram
Using sys

Search previous commands from your .bash_history
This is not actually a command, it's just a keyboard shortchut. But a very useful one.

Rename files in batch

check open ports without netstat or lsof


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